Carburetor



June 24, 1936. REDMOND 1,766,685

CARBURETOR Filed June 8, 1922 @atented dune 24 ESQ ATE ALBERT G. REDMOND, OF FLINT, MICHIGAN, ASSIGNOR TO JACOB RICHARD FRANCIS,

F FLINT,

oannunnron Application filed June 8,

This invention relates to certain new and useful improvements in carburetors and more particularly to that type of carburetor employing asuction controlled valve in connection with a high speed jet, the object being to provide means for injecting into the mixing chamber of the carburetor upon the sudden opening of the suction controlled valve, an extra charge of fuel so as to facilitate the acceleration of the internal combustion engine to which the carburetor is attached, whereby the efficiency of the carburetor will be greatly increased and the fuel consumption reduced.

A further objectof the invention is to provide a carburetor with a chamber having a nozzle or jet extending into the same in such a position that when the suction controlled valve is opened, the fuel will be forced out of the chamber into the mixing chamber of the carburetor so as to increase the richness of the mixture in order to allow the motor to pick up quickly, thereby overcoming the difiiculties now existing of having to set the carburetor so as to use a rich mixture in order to allow for acceleration.

In most of the carburetors now in use, it is necessary to use a rich mixture to facilitate the acceleration of the internal combus BO-tion engine which increases the fuel consumption ofthe carburetor and the object of my invention is to provide means for 111- creasing the richness of the mixture upon sudden acceleration, so that when running under normal conditions, a lean mixture can be used and as the throttle is openedsuddenly, an additional charge will be injected so that the performance of the internal combustion engine to which the carburetor is attached will be greatly improved.

ther and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the drawings 1 have shown a longitudinal vertical section through a carburetor constructed in accordance with my invention in which 1 indicates the body of the carbureter having a mixing chamber 2 provided with a flanged outlet 3 adapted to be con- 1922. Serial No. 566,782.

nected to the intake manifold of the internal combustion engine in the usual manner.

The outlet is provided with the usual throttle valve at as clearly shown. The construction of carburetor as herein shown is what is known as the Marvel type in which a high and low speed nozzle are employed and is preferably formed of a tubular body in which the upper portion forms a mixing chamber 2 and the lower portion is provided with a lateral air inlet 5 provided with a choker valve (3.

Arranged within the lower portion of the carburetor is a body 7 having an air passage 8 into which extends a low speed nozzle 9 which is supplied with fuel by a fuel passage 10 extending from a fuel chamber 11 which is provided with the usual float valve 12 for operating the needle valve 13 for controlling the supply of fuel through the inlet let.

Pivotally mounted on the body 7 is a suction controlled valve 15 which is connected to a spring pressed plunger 16 by a link 17, said plunger being mounted in a tubular adjusting screw 18. Extending from the fuel passage 10 is a high speed nozzle 19 which terminates adjacent the free end of the pivoted suction controlled valve 15 and said valve is under pressure so that when running at low speed it is in closed position, the fuel being supplied by the main fuel nozzle 9 and as the speed of the motor to which the carburetor is attached increases, the valve 15 gradually opens to allow additional fuel to be drawn into the mixing chamber through the high speed nozzle 19.

Arranged under the bottom of the carburetor is a cylinder 20, the lower end of which is closed by a plug 21 and the upper end is provided with an auxiliary fuel nozzle 22 through which fuel is adapted to be forced by the sudden opening of the suction controlled valve so as to inject into the mixing chamber an additional charge of fuel upon the sudden opening of the suction controlled valve as will be hereinafter fully described.

The cylinder- 1 is provided with a fuel inlet 523 to which is connected a fuel supply pipe 24 extending from the bottom of the float or fuel chamber 11.

Mounted within the cylinder 20 is a piston 25 provided with a piston rod 26 working in a tubular guide 27 and to which is pivotally connected a link 28 which has its upper end pivotally connected at 29 to a bracket 30 carried by the suction controlled valve 15 so that as the valve opens, the piston 25 is raised. When the valve is in closed position, the inlet 23 of the cylinder 20 is opened so that the portion of the cylinder above the piston fills with fuel from the fuel chamber and as the piston is raised by the opening of the suction controll'ed valve, the fuel is forced through the fuel nozzle 22 into the mixing chamber of the carburetor so as to increase the richness of the mixture upon the sudden opening of the suction controlled valve caused by the sudden opening of the throttle whereby the engine will pick up uickly. When the piston is moved upwar ly, it closes the fuel inlet of the cylinder so that when running at high speed, the fuel inlet is closed and no additional fuel is drawn or injected through the nozzle 22.

The plug 21' is provided with an air vent 31 from which, as herein shown, extends a pipe 32 which terminates in the upper end of the fuel chamber 11 so that any leakage of fuel by the piston within the cylinder 20 will be forced back into the fuel chamber and this also provides means for venting the cylinder so as to allow the piston to move back in its normal position after it has been raised by the suction controlled valve to inject additional fuel into the mixing chamber.

From the foregoing description it will be seen that I have provided a carburetor with a cylinder having an inlet in communication with the fuel chamber which is open when the internal combustion engine to which the carburetor is attached is running at slow speed and which is closed when running at high speed, the upper portion of the cylinder maintaining a quantity of fuel therein so that when the throttle is opened quickly, an additional charge of fuel will be injected into the mixing chamber of the carburetor so as to increase the richness of the explosive mixture.

The operation of the carburetor constructed in accordance with my invention is as follows: Assuming that the parts are in the position as shown, the upper portion of the cylinder 20 above the piston 25 will be full of fuel and the engine can be run at low bastion engine increases and'the suction controlled valve 15 is opened quickly and as the suction controlled valve swin s on its pivot through its connection with t e piston rod 26, the piston is raised or moved upwardly so as to force the fuel above the piston outthrough the jet 22 into the mixing chamber which increases the mixture so that a very efiicient explosive charge is produced. As the piston moves upwardly, it closes the inlet of the cylinder so that in running be eliminated as the object of providing an opening in the lower end of the cylinder is to allow the piston to move back into its normal position.

What I claim is 1. A carburetor having parallel air inlet passages, high and low speed nozzles arranged respectively in said air passages, a throttle valve, a suction controlled valve movable independently of said throttle valve arranged over the high speed nozzle for closing one of said passages, a cylinder having an inlet in communication with the fuel su ply means, a piston in said cylinder, a nozz e extending from said cylinder into one of said air passages and terminating under said suction controlled valve in a lane below the end of said high speed nozz e, a connection between said piston and said suction controlled valve, said piston closing said fuel inlet as the suction controlled valve is moved into open position.

2. A carburetor having a mixing chamber,

a main air inlet terminating in parallel arranged air inlet passages communicating with said mixing chamber, a suction controlled valve for normally closing one of said air inlet passages, a low speed nozzle discharging into one of said air inlet assages, a high speed nozzle discharging into the other of said air inlet passages, an auxiliary nozzle adapted to discharge fuel into said air inlet passage under said suction controlled valve and means operated by the opening movement of said suction controlled valve for injecting fuel for a predetermined length of time only through said auxiliary nozzle.

3. A carburetor comprising a mixing chamber having parallel air inlet passages, a throttle valve mounted in said mixing I have shown the air vent I chamber, high and low speed fuel nozzles arrangedrespectively in said air passages, means for supplying fuel to said nozzles, a

' suction controlled valve for normally closing one of said air passages and movable independently of said throttle valve, an auxiliary fuel nozzle extending into one of said air passages under said suction controlled valve, a cylinder in communication with said fuel supply means, and a piston mounted in said cylinder having a connection with said suction controlled valve for injecting an additional charge of fuel through said auxiliary nozzle upon the opening of said suction controlled valve, the opening movement of said valve cutting oif the supply of fuel to said auxiliary nozzle.

4. A carburetor comprising a casing having a mixing chamber, a throttle valve mounted therein, a body arranged in said casing to form parallel air passages, a fuel nozzleextending into one of said air pas.- sages, a fuel passage, a high speed nozzle extending from said fuel passage into the other air passage, a suction controlled valve arranged over said high speed nozzle for closing one of said air passages, and movable independently of said throttle valve, a fuel chamber for supplying fuel to said fuel passage, a cylinder in communication with said fuel supply means, a nozzle extending from said cylinder and terminating under said suction controlled valve in a plane below the high speed nozzle, a piston in said cylinder having a connection with said suction controlled valve for forcing fuel out of said cylinder and through said nozzle, said piston closing the communication between I said cylinder and said fuel supplying means upon the opening of said suction controlled valve.

5. A carburetor having a mixing chamber provided with parallel air passages, a throttle valve, a pivoted suction controlled valve movable independently of said throttle valve for normally closing one of said air passages, means for supplyingv fuel to said air passages, an auxiliary fuel nozzle arranged under said suction controlled valve, a cylinder provided with a plston having a connection with sa1d suction controlled valve, means for supplying fuel to said cylinder when said suction controlled valve is in closed position, said piston injecting fuel into said mixing chamber of said carburetor through said auxiliary fuel nozzle upon the opening of said suction con-. trolled valve and simultaneously cutting off said fuel supply.

6. A carburetor having a m xing chamber provided with parallel airsupplying passages, a throttle valve arranged in said m1xing chamber, high and low speed nozzles arranged respectively in said an passages, means for supplying fuel to said nozzles, a

.for normally holding said valve in closed position, a cylinder having an inlet in communication with said fuel supply, "a nozzle extending from said cylinder into the mixing chamber of said carburetor and terminating under said suction controlled valve, a piston working in said cylinder, and a connection between said piston and said suction controlled valve for moving said piston upwardly for injecting fuel out of said cylinder through said nozzle upon the opening of said suction controlled valve, said piston cuttlng off the supply of fuel from said chamber to said cylinder.

7. A carburetor comprising a mixing chamber having parallel air inlet passages, a low speed nozzle arranged in one of said air inlet passages, a high speed nozzle arranged m the other air inlet passage, a pivoted suction controlled valve mounted in said mixing chamber for normally closing the last-mentioned air inlet passage, :1 source of fuel supply for said nozzles, a cylinder having an inlet in one side thereof in communication with the fuel supply, a nozzle extending from said cylinder into one of said air passages beneath said suction controlled v'alve, a piston working in said cylinder, a link connecting said piston to said suction controlled valve, the opening in said cylinder being so disposed that fuel is supplied to the cylinder when the suction controlled valve is closed and the piston moves over said opening when the suction controlled valve is open to cut off the fuel supply.

8. A carburetor having two parallelai'r lnlet passages" for supplying air thereto, means for supplying fuel to each of said air passages, a throttlevalve, a suction controlled valve for controlling-one of said air passages, a chamber having a nozzle termi nating under said suction controlled valve,

a piston working in said chamber having a connection with said suction controlled valve, independent means for supplying fuel to said chamber, said independent fuel-supplying means being controlled by the openmg movement of said suction controlled :valve.

9. A carburetor comprising a casing provided with a fuel bowl and a carbureting passage, two parallel arranged air inlets for supplying air to said carbureting passage,

means for supplying fuel to said chamber, said means being closed by the movement of said suction controlled valve and a passage extending from the bottom of said chamber to the top of said fuel bowl.

In testimony whereof I hereunto afllx my signature.

ALBERT G. REDMONI). 

